경량화용 CFRP/Foam 부재의 에너지흡수 특성

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The most important goals in designing automobile are safety and environment-friendless. Vehicle structure must be lightweight in order to improve fuel-efficiency and reducing exhaust fumes. Therefore, the designing vehicles should be more concerned on the aspect of securing safety performance, the while, it also should consider reducing weight of vehicle structural member. CFRP(Carbon Fiber Reinforced Plastics) of the advanced composite materials as structure materials for vehicles, has a widely application in lightweight structural materials of air planes, ships and automobiles because of high strength and stiffness.
In the study, one type of circular shaped composite tube was used, combined with polyurethane foam. Experimental investigations are carried out for CFRP circular members in order to study the effect of various stacking condition. Static collapse tests were performed with change of the stacking condition, such as fiber orientation angle, interface number and density of polyurethane foam. Collapse mode and energy absorption characteristics were analyzed.
Following the above study, conclusions are drawn as below;

1. Test specimen showed the crushing on triggered direction, and external layer was affected significantly. In addition, energy absorption performance was improved when the direction of first was 90° and thickness of ply in 90° was high.
2. The CFRP side member was collapsed according to the different orientation angles by compounding of the 4 different modes: transverse shearing, laminar bending, brittle fracture, and local buckling. When the fiber orientation angle is small, the member absorbed energy by laminar bending. As the fiber orientation angle increases, the member was absorbed energy by local buckling and matrix crack due to transverse shearing.
3. For 0° of external layer, absorption energy was increased with number of interface number, but 90° displayed the reduction in absorption energy and increase in afterward.
4. By filling of empty space in CFRP circular member with polyurethane foam, total absorption energy and means load was increased for 30~40% and 20~50%, respectively.
Alternative Title
The Energy Absorption Characteristics of CFRP/Foam Members for the use of Lightweight
Alternative Author(s)
Choi, Ju Ho
조선대학교 대학원
일반대학원 첨단부품소재공학과
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Table Of Contents
제 1 장 서 론 1
1-1 연구배경 1
1-2 연구목적 및 방법 5

제 2 장 시험편 및 실험방법 7
2-1 시험편 7
2-2 실험방법 12

제 3 장 CFRP 원형부재의 정적압궤특성 14
3-1 적층각 변화에 따른 CFRP 원형부재의 압궤실험 14
3-2 계면수 변화에 따른 CFRP 원형부재의 압궤실험 19
3-3 결과 및 고찰 30
3-3-1 압궤 모드 30
3-3-2 에너지 흡수 특성 32

제 4 장 CFRP/Foam 원형부재의 정적압궤특성 36
4-1 적층각 변화에 따른 CFRP/Foam원형부재의 압궤실험 36
4-2 계면수 변화에 따른 CFRP/Foam원형부재의 압궤실험 45
4-3 결과 및 고찰 66
4-3-1 압궤 모드 66
4-3-2 에너지 흡수 특성 69

제 5 장 결 론 76

참 고 문 헌
조선대학교 대학원
최주호. (2010). 경량화용 CFRP/Foam 부재의 에너지흡수 특성.
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General Graduate School > 3. Theses(Master)
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  • Embargo2011-03-03
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